bug fix

Author: Christopher Liu

data/org.sugarlabs.MusicBlocks.yaml

@@ -66,7 +66,6 @@ modules:
     buildsystem: simple
     build-commands:
       - install -Dm 755 musicblocks-run /app/bin/musicblocks-run
-      - chmod +x /app/bin/musicblocks/musicblocks
     sources:
       - type: script
         dest-filename: musicblocks-run